Precomputation.
Project: http://git-wip-us.apache.org/repos/asf/commons-rng/repo Commit: http://git-wip-us.apache.org/repos/asf/commons-rng/commit/ab462939 Tree: http://git-wip-us.apache.org/repos/asf/commons-rng/tree/ab462939 Diff: http://git-wip-us.apache.org/repos/asf/commons-rng/diff/ab462939 Branch: refs/heads/1.0-release Commit: ab46293943634b7689761512f8c3dbf47de59e8b Parents: 9d1e0f3 Author: Gilles <er...@apache.org> Authored: Sun Nov 27 05:40:19 2016 +0100 Committer: Gilles <er...@apache.org> Committed: Sun Nov 27 05:40:19 2016 +0100 ---------------------------------------------------------------------- .../apache/commons/rng/sampling/distribution/PoissonSampler.java | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/commons-rng/blob/ab462939/commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/PoissonSampler.java ---------------------------------------------------------------------- diff --git a/commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/PoissonSampler.java b/commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/PoissonSampler.java index 9ac3249..ca2f7ce 100644 --- a/commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/PoissonSampler.java +++ b/commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/PoissonSampler.java @@ -66,7 +66,9 @@ public class PoissonSampler gaussian = new BoxMullerGaussianSampler(rng, 0, 1); exponential = new AhrensDieterExponentialSampler(rng, 1); - factorialLog = InternalUtils.FactorialLog.create(); + factorialLog = mean < PIVOT ? + null : // Not used. + InternalUtils.FactorialLog.create().withCache((int) Math.min(mean, 2 * PIVOT)); } /** {@inheritDoc} */
